looking to get a lumia 640

I'm looking to get a windows phone should be pretty cheap now?
will the 640 do the job I see it has 1GB of ram? and 8 GB storage?
will that be slow I'm with ATT. or should I look at the 930 unlock
that has 32 GB oh and will it get windows 10 on either.
thanks

@ep1 640 is a useful phone if you aren't doing heavy usage stuff like heavy games and office. I've used mine for more than 2 years and still does all my emails and pics and night photography easily.

Plus the added benefit of having a cheaper phone is that if it drops or gets pickpocketed you don't feel the 'pinch' as much. I had a lumia 520 which was snatched, and am thankful I didn't buy a Lumia 920. :)